The key to any successful lice treatment is a lice shampoo that has a 100% kill rate. The problem with head lice which makes it so hard to get rid of is if you leave behind even one nit it can hatch and become a louse. A louse can mature and begin laying live eggs in a few days. It doesn't take much to get out of control. A lice infestation manifest itself quickly. That's why it's important to use the Licenders enzyme shampoo. It has a 100% kill rate and it contains only natural ingredients.